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Danny Chen commented on CALCITE-4014: ------------------------------------- Thanks, [~groobyming] for reporting this ~ I saw the syntax we support from the parser: ```sql <CONVERT> { s = span(); } <LPAREN> e = Expression(ExprContext.ACCEPT_SUB_QUERY) { args = startList(e); } <USING> name = SimpleIdentifier() { args.add(name); } <RPAREN> { return SqlStdOperatorTable.CONVERT.createCall(s.end(this), args); } ``` That means we did support CONVERT( ... USING ...) clause. But you are right, we do not translate the charSet correctly, there needs more effort in the convert table [1], we need to translate the charSet as a constant instead of a column name. [1] https://github.com/apache/calcite/blob/05376d6bff11ccef690addb4f9c40ab16dd20bec/core/src/main/java/org/apache/calcite/rex/RexSqlStandardConvertletTable.java#L103 > calcite convert(column using utf8mb4) throws exception > ------------------------------------------------------ > > Key: CALCITE-4014 > URL: https://issues.apache.org/jira/browse/CALCITE-4014 > Project: Calcite > Issue Type: Bug > Components: core > Affects Versions: 1.21.0 > Reporter: groobyming > Priority: Major > Attachments: image-2020-05-20-17-00-28-611.png > > > Hello everyone, I found that when performing the following sql > verification, I will be prompted that the UTF8MB4 field cannot be found in > the table, but after reading the source code calcite is built-in to support > this convert function, is it not fully implemented yet? > > SQL is as follows: > select convert(name using utf8mb4) from test b where name = '4' > > Error Message: > !image-2020-05-20-17-00-28-611.png! -- This message was sent by Atlassian Jira (v8.3.4#803005)